Csharp/C Sharp by API/System.Data.OleDb/OleDbDataReader

OleDbDataReader.GetInt32

 
using System;
using System.Data;
using System.Data.OleDb;
class MainClass
{
  static void Main(string[] args)
  {
        string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=c:\Northwind.mdb";
        string SQL = "SELECT * FROM Orders";
        OleDbConnection conn = new OleDbConnection(ConnectionString);       
        OleDbCommand cmd = new OleDbCommand(SQL);
        cmd.Connection = conn;
        conn.Open();
        OleDbDataReader reader = cmd.ExecuteReader();
        try 
        {
            while (reader.Read()) 
            {
                Console.Write("OrderID:"+reader.GetInt32(0).ToString() );
                Console.Write(" ,");
                Console.WriteLine("Customer:" + reader.GetString(1).ToString() );
            }
        }
        finally 
        {
            reader.Close();
            conn.Close();
        }   
  }
}

OleDbDataReader.GetString

 
using System;
using System.Data;
using System.Data.OleDb;
class MainClass
{
  static void Main(string[] args)
  {
        string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=c:\Northwind.mdb";
        string SQL = "SELECT * FROM Orders";
        OleDbConnection conn = new OleDbConnection(ConnectionString);       
        OleDbCommand cmd = new OleDbCommand(SQL);
        cmd.Connection = conn;
        conn.Open();
        OleDbDataReader reader = cmd.ExecuteReader();
        try 
        {
            while (reader.Read()) 
            {
                Console.Write("OrderID:"+reader.GetInt32(0).ToString() );
                Console.Write(" ,");
                Console.WriteLine("Customer:" + reader.GetString(1).ToString() );
            }
        }
        finally 
        {
            reader.Close();
            conn.Close();
        }   
  }
}

OleDbDataReader.Read()

  
using System;
using System.Data;
using System.Data.OleDb;
class MainClass
{
   static void Main(string[] args)
   {
      string connString = "provider=sqloledb;server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
      string sql = @"select * from employee";
      OleDbConnection conn = null;
      OleDbDataReader reader = null;
      try
      {
         conn = new OleDbConnection(connString);
         conn.Open();
         OleDbCommand cmd = new OleDbCommand(sql, conn);
         reader = cmd.ExecuteReader();
         Console.WriteLine("Querying database {0} with query {1}\n", conn.Database, cmd.rumandText );
         while(reader.Read()) {
            Console.WriteLine("{0} | {1}", reader["FirstName"].ToString().PadLeft(10), reader[1].ToString().PadLeft(10));
         }
      }
      catch (Exception e)
      {
         Console.WriteLine("Error: " + e);
      }
      finally
      {
         reader.Close();
         conn.Close();
      }
   }
}